'\" t
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
.\" SPDX-License-Identifier: GPL-2.0-or-later
.\"
.\" References consulted:
.\"   GNU glibc-2 source code and manual
.\"   Dinkumware C library reference http://www.dinkumware.com/
.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\"   ISO/IEC 9899:1999
.\"
.TH iswalnum 3 2023-02-05 "Linux man-pages 6.03"
.SH NAME
iswalnum \- test for alphanumeric wide character
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.B #include <wctype.h>
.PP
.BI "int iswalnum(wint_t " wc );
.fi
.SH DESCRIPTION
The
.BR iswalnum ()
function is the wide-character equivalent of the
.BR isalnum (3)
function.
It tests whether
.I wc
is a wide character
belonging to the wide-character class "alnum".
.PP
The wide-character class "alnum" is a subclass of the wide-character class
"graph", and therefore also a subclass of the wide-character class "print".
.PP
Being a subclass of the wide-character class "print",
the wide-character class
"alnum" is disjoint from the wide-character class "cntrl".
.PP
Being a subclass of the wide-character class "graph",
the wide-character class "alnum" is disjoint from
the wide-character class "space" and its subclass "blank".
.PP
The wide-character class "alnum" is disjoint from the wide-character class
"punct".
.PP
The wide-character class "alnum" is the union of the wide-character classes
"alpha" and "digit".
As such, it also contains the wide-character class
"xdigit".
.PP
The wide-character class "alnum" always contains at least the letters \[aq]A\[aq]
to \[aq]Z\[aq], \[aq]a\[aq] to \[aq]z\[aq] and the digits \[aq]0\[aq] to \[aq]9\[aq].
.SH RETURN VALUE
The
.BR iswalnum ()
function returns nonzero
if
.I wc
is a wide character
belonging to the wide-character class "alnum".
Otherwise, it returns zero.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.BR iswalnum ()
T}	Thread safety	MT-Safe locale
.TE
.hy
.ad
.sp 1
.SH STANDARDS
POSIX.1-2001, POSIX.1-2008, C99.
.SH NOTES
The behavior of
.BR iswalnum ()
depends on the
.B LC_CTYPE
category of the
current locale.
.SH SEE ALSO
.BR isalnum (3),
.BR iswctype (3)
